Air treatment device



FIG. 1 is a perspective view of an air treatment device showing our new design;

FIG. 2 is a first side view thereof;

FIG. 3 is a second side view thereof;

FIG. 4 is a third side view thereof;

FIG. 5 is a fourth side view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a top view thereof.

The broken lines shown within the figures form no part of the claimed design. 

CLAIM The ornamental design for an air treatment device, as shown and described. 